Window arrangement and sash lifting mechanism



. y 7, 1946- 5 H. PIRON 0 WINDOW ARRANGEMENT AND SASH LIFTING MECHANISM Filed Sept. 10, 1943 {Na K m%%//// Patented May 7, 1946 WINDOW ARRANGEMENT AND L IF'I ING MEGHANISM v :Emil H. Piron, ,New York, N. Y. assignorl to Transit Research; Corporation, New York,

SASYH N. Y., a corporation of New York v Application September 10, 1943, Serial No. 501,905

1 Claim.

This invention relates to window sash lifting mechanisms of particular utility on vehicles such as street cars and buses.

Formerly, window sashes of public vehicles have been arranged to open by upward pressure on finger grips. The sashes would very often stick and in any case were difiicult to open. In the more modern street cars roller devices have been employed by which the window is elevated by rotating a crank located above the sash. These latter devices have been generally satisfactory except for occasional breakage by passengers but are so constructed that they do not lend themselves to installation where stationary windows are to be provided above the movable sash for the benefit of standee passengers.

It is an object of this invention to provide a window lifting mechanism for operation by a conveniently located crank, which will provide parallel upward and downward pressures at opposite horizontal corners of the sash, which will be sturdy of construction and capable of withstanding the hard usage expected of it, and which is so arranged that it will not interfere with the placement of a standee window above the movable sash.

More particularly it is an object of the present invention to provide a mechanism composed essentially of a continuous chain which engages sprockets, two of the sprockets being located adjacent the two top corners of the sash, two pairs of sprockets being located substantially thereabove and so arranged to provide two parallel vertical runs to which the sash is attached, together with a speed reduction means which requires a multiplicity of rotations of the crank to fully elevate the window and which acts as a friction device against lowering of the window by gravity during running of the vehicle. The continuous chain encompasses the standee window on three sides so that the standee window and the movable window overlap when the movable window is in elevated position.

Other objects and advantages will become hereinafter more fully apparent as reference is had to the accompanying drawing in which my invention is illustrated and in which Figure l is a vertical section through a portion of the wall of a vehicle at the window showing my improved window lifting mechanism in side elevation, taken along the line I-l of Figure 2, and

Figure 2 is a front view of the mechanism as it is installed with a sash and standee window.

More particularly, l refers to the outside wall or shell of a vehicle such as a bus or street car, braced by the posts 2 between which windows are located. A drip rail 3.is usually found at the top of the window opening.

The movable window sash is indicated at 4 and immediately thereabove is a fixed sash 5, for the benefit of standing passengers and commonly referred to as a standee window.

In order to elevate the sash 4 I provide, first, two sprockets 6 and I located adjacent the upper corners of the sash 4 and mounted to rotate on two pins which are fixedly secured to the posts 2. Substantially vertically above each of the sprockets I provide two pairs of sprockets 8 and 9, and I0 and II, the pairs forming with the sprockets 6 and I a square within which the standee window 5 resides, as viewed in Figure 2. A continuous chain I2 engages all of said sprockets, two runs of chain substantially following the sides of the square except for the top of the sash 4. At least two of the vertical runs are parallel with each other.

The sash 4 is equipped with brackets l3 and the fingers I4 may be considered as a sash engaging means to connect the chain and the two upper corners of the sash.

It will be seen that rotation of any sprocket B, I, 8, 9, H) or II will cause movement of the chain and elevation of the sash 4 to a position overlapping the fixed sash 5 and that reversal of the direction of rotation will permit closing of the sash. Thus a hand crank could be attached to any of these sprockets but it is desirable to introduce a speed reduction means between the sash 4 and the chain l2 in order to increase the revolutions of the crank necessary to open the window. It is also desirable to introduce friction to prevent lowering of the sash by gravity during operation of the vehicle, and it is also desirable to prevent undue strain being placed directly on the chain I0. I therefore provide two additional sprockets of different diameters and a continuous chain thereover. One of the sprockets I5 is coaxial and rigid or integral with one of the other sprockets which may conveniently be the sprocket 9. This sprocket has a diameter preferably about twice that of the other sprocket I 6 which carries the manual crank l1 and which may be located at any convenient point. The chain I 8 engages these two sprockets I5 and I6 and is provided with two pins I9 and 20 which engage a fixed bracket 2| when the window is fully elevated and fully lowered, respectively, so that further pressure on the crank I1 after the sash has attained either of its two final positions will not be transmitted to the main chain l2.

In order to adjust the tension on the chain In, one sprocket which may conveniently be the sprocket 8 is mounted for adjustment. The axle pin of this sprocket is mounted on a plate 22 having a slot 23 therein to permit the adjustment.

Various changes may be made without departing from the spirit of my invention and'I there fore desire to be extended protection as defined by the appended claim.

What I claim is:

A sash lifting mechanism comprising a plu rality of sprockets, a continuous chain over said sprockets having parallel runs, one of said parallel runs being fastened to one corner of said sash and another of said runs being fastened to said other additional sprocket whereby undue strains imposed on said crank are precluded from being imposed on said other sprocket and said first mentioned chain.

EMIL H. PIRON. 

